Its long been my opinion that most peoples first exposure to PV will be through simple battery chargers. The problem has been that there wasn't a standard charger interface for all the cell phones and gadgets. The EU has just taken an important step in standardizing uniform cell phone chargers
beginning next year. I suspect that the US will likely follow suit adopting the standard. Hopefully all the other handheld gadgets worldwide will adopt the same standard. With such widespread adoption of the charging interface, it is likely PVs battery chargers will be introduced to support this standard interface. I'll venture they'll retail in the $20 to $30 range and they'll make popular gifts. Hopefully such PV chargers will help driving further economies of scale in the PV industry.